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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfad79e066cc45f7cdd232fa634e0533015bf6d744d1ae0a0fe57fceda1b92aa' 
  AND token = '4gKCR4m270so+GRRgrdyTB85pgFygcB7qlR4JU515Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}